A team of Italian radio boffins – and one Swede – have one-upped their pioneering countryman Guglielmo Marconi by demonstrating a method of simultaneously transmitting multiple signals on the same frequency.

(Nanowerk News) Laser beams can be made to form dark as well as bright intensity helices, or corkscrews of light. In a paper shortly to appear in Optics Express, Dr Ole Steuernagel, at the University of Hertfordshire's Science and Technology Research Institute, has now shown that forming dark helices can have considerable advantages over employing their commonly considered bright cousins. Light helices may have many fundamental and technological applications in lithography and the manipulation of particles through optical forces, such as particle trapping and particle transport. In lithography, the light helices can create novel materials with helical imprints to provide left- or right-handed optically active materials. When applied in laser tweezers that manipulate particles through optical forces, helices can be used as a handedness filter for twisted molecules, create twisted waveguides for trapped quantum particles and even provide intertwined transport via intertwined optical helix configurations.

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Image illustrates a single bright helix (red line) superimposed with a single dark helix (black line)

in case you forgot ... your DNA is also Helical .... like Alpha Quartz